Logo Search packages:      
Sourcecode: linux version File versions  Download package

mmzone.h

/*
 * Written by Pat Gaughen (gone@us.ibm.com) Mar 2002
 *
 */

#ifndef _ASM_MMZONE_H_
#define _ASM_MMZONE_H_

#include <asm/smp.h>

#ifdef CONFIG_DISCONTIGMEM

extern struct pglist_data *node_data[];
#define NODE_DATA(nid)        (node_data[nid])

#define node_localnr(pfn, nid)      ((pfn) - NODE_DATA(nid)->node_start_pfn)
#define node_start_pfn(nid)   (NODE_DATA(nid)->node_start_pfn)
#define node_end_pfn(nid)                                   \
({                                                    \
      pg_data_t *__pgdat = NODE_DATA(nid);                        \
      __pgdat->node_start_pfn + __pgdat->node_spanned_pages - 1;  \
})

#define pmd_page(pmd)         (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
/*
 * pfn_valid should be made as fast as possible, and the current definition
 * is valid for machines that are NUMA, but still contiguous, which is what
 * is currently supported. A more generalised, but slower definition would
 * be something like this - mbligh:
 * ( pfn_to_pgdat(pfn) && ((pfn) < node_end_pfn(pfn_to_nid(pfn))) )
 */
#if 1 /* M32R_FIXME */
#define pfn_valid(pfn)  (1)
#else
#define pfn_valid(pfn)  ((pfn) < num_physpages)
#endif

/*
 * generic node memory support, the following assumptions apply:
 */

static __inline__ int pfn_to_nid(unsigned long pfn)
{
      int node;

      for (node = 0 ; node < MAX_NUMNODES ; node++)
            if (pfn >= node_start_pfn(node) && pfn <= node_end_pfn(node))
                  break;

      return node;
}

static __inline__ struct pglist_data *pfn_to_pgdat(unsigned long pfn)
{
      return(NODE_DATA(pfn_to_nid(pfn)));
}

#endif /* CONFIG_DISCONTIGMEM */
#endif /* _ASM_MMZONE_H_ */

Generated by  Doxygen 1.6.0   Back to index